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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/boost/libs/date_time/example/local_time/seconds_since_epoch.cpp | |
parent | Initial commit. (diff) | |
download | ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.tar.xz ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/boost/libs/date_time/example/local_time/seconds_since_epoch.cpp | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/boost/libs/date_time/example/local_time/seconds_since_epoch.cpp b/src/boost/libs/date_time/example/local_time/seconds_since_epoch.cpp new file mode 100644 index 000000000..decaf33bb --- /dev/null +++ b/src/boost/libs/date_time/example/local_time/seconds_since_epoch.cpp @@ -0,0 +1,65 @@ +/* This example demonstrates the use of the time zone database and + * local time to calculate the number of seconds since the UTC + * time_t epoch 1970-01-01 00:00:00. Note that the selected timezone + * could be any timezone supported in the time zone database file which + * can be modified and updated as needed by the user. + * + * To solve this problem the following steps are required: + * 1) Get a timezone from the tz database for the local time + * 2) Construct a local time using the timezone + * 3) Construct a posix_time::ptime for the time_t epoch time + * 4) Convert the local_time to utc and subtract the epoch time + * + */ + +#include "boost/date_time/local_time/local_time.hpp" +#include <iostream> + +int main() +{ + using namespace boost::gregorian; + using namespace boost::local_time; + using namespace boost::posix_time; + + tz_database tz_db; + try { + tz_db.load_from_file("../data/date_time_zonespec.csv"); + }catch(const data_not_accessible& dna) { + std::cerr << "Error with time zone data file: " << dna.what() << std::endl; + exit(EXIT_FAILURE); + }catch(const bad_field_count& bfc) { + std::cerr << "Error with time zone data file: " << bfc.what() << std::endl; + exit(EXIT_FAILURE); + } + + time_zone_ptr nyc_tz = tz_db.time_zone_from_region("America/New_York"); + date in_date(2004,10,04); + time_duration td(12,14,32); + // construct with local time value + // create not-a-date-time if invalid (eg: in dst transition) + local_date_time nyc_time(in_date, + td, + nyc_tz, + local_date_time::NOT_DATE_TIME_ON_ERROR); + + std::cout << nyc_time << std::endl; + + ptime time_t_epoch(date(1970,1,1)); + std::cout << time_t_epoch << std::endl; + + // first convert nyc_time to utc via the utc_time() + // call and subtract the ptime. + time_duration diff = nyc_time.utc_time() - time_t_epoch; + + //Expected 1096906472 + std::cout << "Seconds diff: " << diff.total_seconds() << std::endl; + +} + + +/* Copyright 2005: CrystalClear Software, Inc + * http://www.crystalclearsoftware.com + * + * Subject to the Boost Software License, Version 1.0. + * (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) + */ |